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that line isn't the horizon, it's the edge of the shadow that separates day from night time. There's no way to perceive it at ground level, but if you're high in the air and the sun is near the horizon it's visible.
also why are you on the fediverse if you're gonna shill for corporate social media?
Check out OP's one other post -- claiming that the Challenger disaster was a deep-fake. That should answer your questions.